The SRD only gives a means to determine costs and weights of weapons for Large and Small versions based on the Medium weapons. Any other supplied values are the author's best determination.

Orc dreadaxes are two-handed axes with a blade even larger than a greataxe.

Orcish

Orcs may treat the orc dreadaxe as a martial weapon.

Slow Recovery

The dreadaxe's balance is so forward-heavy that it is difficult to ready after a swing, and impossible to parry with. The wielder of a dreadaxe suffers a -1 penalty to AC. Due to the size and weight the weapon is slower to swing and therefore easier to dodge. The wielder suffers -1 penalty to attack.

Crude

Orcish steel is a low carbon alloy, barely better than iron. The dreadaxe has a -1 penalty on damage rolls.

Intimidating

A masterwork dreadaxe is usually adorned with terrifying motifs and spikes that enhance its already brutish design. This grants a +2 bonus to intimidate checks